<html>

<head>
    <script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyDJW4jsPlNKgv6jFm3B5Edp5ywgdqLWdmc&sensor=false">
    </script>

    <script>
        function initialize() {
            var mapProp = {
                center: new google.maps.LatLng(51.508742, -0.120850),
                zoom: 5,
                mapTypeId: google.maps.MapTypeId.ROADMAP
            };
            var map = new google.maps.Map(document.getElementById("googleMap"), mapProp);
        }

        google.maps.event.addDomListener(window, 'load', initialize);
    </script>
</head>

<body>
    <div id="googleMap" style="width:500px;height:380px;"></div>

</body>

</html>